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xen: Add xen_create_contiguous_region

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A memory region must be physically contiguous in order to be accessed
through DMA.  This patch adds xen_create_contiguous_region, which
ensures a region of contiguous virtual memory is also physically
contiguous.

Based on Stephen Tweedie's port of the 2.6.18-xen version.

Remove contiguous_bitmap[] as it's no longer needed.

Ported from linux-2.6.18-xen.hg 707:e410857fd83c

[ Impact: add Xen-internal API to make pages phys-contig ]

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Alex Nixon 2009-02-09 12:05:46 -08:00 • committed by Konrad Rzeszutek Wilk
parent 19001c8c5b
commit 08bbc9da92
3 changed files with 249 additions and 0 deletions
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6
include/xen/xen-ops.h
View file

@ -14,4 +14,10 @@ void xen_mm_unpin_all(void);
void xen_timer_resume(void);
void xen_arch_resume(void);
extern unsigned long *xen_contiguous_bitmap;
int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
unsigned int address_bits);
void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order);
#endif /* INCLUDE_XEN_OPS_H */